Date: Fri, 22 Feb 2008 13:45:18 +0800 From: "Xinyu Dong" <iamdxy@gmail.com> To: freebsd-stable@freebsd.org Subject: mddisk(ramdisk) root system that image size limit ? Message-ID: <9c2955e10802212145m30315c18o7249d83db19e8b98@mail.gmail.com>
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OS: FreeBSD 6.2-RELEASE
Environment = VMWare (Version 5) and Computer (CPU=Intel P4 2.4G,
Memory=Kingston 1G DDR400, Storage=2G CF)
create a less-than 100MB of image (image for ramdisk, mfs root)
The loader.rc {
load kernel // The kernel used 6.2 GENERIC
load -t mfs_root /image // dd if=/dev/zero of=/image bs=1k count=95k
}
above config can boot normal.
create a greater than 100MB of image (image for ramdisk, mfs root)
The loader.rc {
load kernel // The kernel used 6.2 GENERIC
load -t mfs_root /image // dd if=/dev/zero of=/image bs=1k count=128k
}
above config can't boot normal, reboot immediately.
create a equal 100MB or equal 99MB of image (image for ramdisk, mfs root)
The loader.rc {
load kernel // The kernel used 6.2 GENERIC
load -t mfs_root /image // dd if=/dev/zero of=/image bs=1k count=100k
(or count=99k)
}
above config can't boot normal, kernel panic.
[TEST after system up]
1. dd if=/dev/zero of=/image bs=1k count=128k
2. mdconfig -a -t vnode -f /image -u 0
3. bsdlabel -Bw /dev/md0 auto
4. newfs /dev/md0a
5. mount /dev/md0a /mnt
When system up normally: df -h
Filesystem Size Used Avail Capacity Mounted on
/dev/ad0s1a 23G 1.5G 20G 7% /
devfs 1.0K 1.0K 0B 100% /dev
/dev/md0a 124M 4.0K 114M 0% /mnt
system not panic.
but config loader.rc, add "load -t mfs_root /image" or "load -t md_image
/image" will panic.
I tried configuring the kernel, change MD_ROOT_SIZE and
MAXDSIZ=(1024UL*1024*1024); MAXSSIZ=(512UL*1024*1024);
DFLDSIZ=(1024UL*1024*1024), panic still.
help
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